duality

Noun
  1. Being twofold;
    A classification into two opposed parts or subclasses (synset 107956120)
    "the dichotomy between eastern and western culture"
    is a type of: categorisation, categorization, classification - a group of people or things arranged by class or category
    same as: dichotomy
  2. (physics) the property of matter and electromagnetic radiation that is characterized by the fact that some properties can be explained best by wave theory and others by particle theory (synset 104927745)
    referred to in: natural philosophy, physics - the science of matter and energy and their interactions
    is a type of: property - a basic or essential attribute shared by all members of a class
    same as: wave-particle duality
  3. (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry (synset 104743577)
    referred to in: geometry - the pure mathematics of points and lines and curves and surfaces
    is a type of: exchangeability, fungibility, interchangeability, interchangeableness - the quality of being capable of exchange or interchange

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